Frostline is the closest thing I've experienced to a traditional MvM but in Guardian gamemode. To be honest it feels like what you'd expect from the transition, waves are difficult to handle and play almost like a puzzle to try to find the right class/weapon composition to handle.
Layout-wise I found both holding and pushing to be satisfying yet difficult. The first CP shed was very claustrophobic, with little significant health that wouldn't involve taking a large risk or taking myself out of the fight.
The short bot-stun on cap as well as high ground over the player spawn once reaching the open means the map places a large emphasis on chokes for victory.
Overall I had a fun experience playing through the waves, but they were a little brutal for my taste. In future versions I'd be interested if you tried to experiment with giving players high-ground, more space in general, and maybe less threatening/high-damage bots.
